Trolley.



PATENTEDAPR. 14, 1908. E. 0A MBRON. K

. TROLLEY. APPLICATION FILED APR. 25, 1907.

' Inventor Attorneys.

Witnesses.-

UNITED STATES PATENT OFFICE.

EWAN CAMERON, OF BROOKLYN, NEW YORK, ASSIGNOR TO ALAN J. CAMERON, OF BROOKLYN,

. NEW YORK.

TBOLLEY.

To all whom it may concern:

Be it known that I, EWAN CAMERON, a citizen of the United States, and a resident of the borough of Brooklyn, county of Kings, and State of New York, have invented a Trolley, of which the following is a specification.

The object I have in view is the improvements in trolleys for overhead tracks.

Bymy invention I seek to increase the life of the trolley, reduce the expense of repairs and make it stronger and cheaper than has heretofore been the case. make the trolley so that it will run more smoothly than has heretofore been possible.

Other objects will more fully appear from the following specification and accompanyin? drawings taken together or separately.

11 the drawings, Fl ure 1 is a side view of a rail and a trolley em odying my invention. Fig. 2 is a section on the line aa of Fig. 1.

- Fig. 3 is a top view of the trolley ofl of the rail; and Fig. 4 is a section of the frame of the trolley taken on the line bb of Fig. 2 but showing a longer wheel base than shown in Figs. 1 and 3.

In all the views like parts are designated by the same reference characters.

In carrying out my invention I provide a frame which comprises a yoke 1, which is bent to U-shape and carries a cross piece 2 on each limb. These cross pieces are attached to the yoke by rivets 3. The cross pieces carry the axles 4, which support the wheels 5. The limbs of the yoke are not parallel but are separated at an angle, as shown in Fig. 2, so that the wheels will be inclined to permit them to run truly upon the upper edge of the lower flange of the rail 6. The middle of the yoke 1 is uncurved, as shown in Fig. 2, the limbs being bent sharply at 77. The distance between the points 77 is made as great as possible so that the link 8 will have as big a bearing upon the yoke as can bemade. This link 8 is preferably made of two pieces of material of flattened cross section, which are secured together by a rivet 9, their upper ends forming hooks 10 which pass over the middle of the yoke 1. That portion of the yoke lying between the bends 77 being straight, and the hooks 10 being straight, a long bearing will be secured, and the yoke will bethereby reinforced, so that if the yoke flexes at all under overloads, the

Specification of Letters Patent.

Application filed April 25, 1907.

I also seek to Patented April 14, 1908.

Serial No. 370,154.

flexation will be confined to the points 77.

The link is provided with a hole 11 for attachment of the hook 15, for supporting the article which is carried by the trolley. This hook will lie in a direction parallel to the track, as will be clear, it being understood that the link 8 is at right angles to the track.

As an additional support for the yoke its upper extremities are bent over at 12 where they rest upon the top of the cross pieces 2. The lower edge of the bent-over portion tapers from the center toward the ends, as shown in Fig. 1, producing a blunt knifeedge 13. This knife-edge rests upon the upper face of each of the cross pieces and serves as the main support for the yoke. The connection on the rivets 3 is a loose one, the knife edges taking part of the load. They also permit a certain independent movement of the cross pieces to accommodate inequalities in the track or wear in the trolley.

The cross pieces have insets 14 to accommodate the yoke 1, and at the same time permit the use of shorter axles than would be the case if such insets were not provided.

From my invention it will be seen that-the bent portions 77 of the yoke being located beyond the edge of the track, or are separated by a greater distance than separates the flanges of the wheels, therefore if the yoke has any tendency to flex it will forcethe wheelsinward, hence the greater the load thei greater the grip of the Wheels upon the rai For the purpose of reducin vibration u on the articles which are carrie by the trol ey, I prefer to have my hook so that the body of it lies' parallel to the railso that it is free to swing as the load is swung without causing any vibrations or grinding effect between the lower surface of the hook and the upper surface of the hole 11. To reduce the vibration still further, I prefer to bevel the hole 11, as shown in Figs. 1 and 2, so that a knife-edge 16 will be formed, which will engage with the hook. This knife-edge takes the entire weight of the load and forms a very small surface for the hook to pivot upon. Where the hook is at right angles to thetrack, as has been the custom heretofore, it rests within the hole, with considerable bearing surface in contact and any swinging of the load causes a rolling motion of the hook upon the lower edge of the hole. It is impossible,

where the hook is transverse, to bevel the hole and thereby produce a knife-edge for the reason that the surface of the hook in this direction is not sufficient to permit this to bedone.

This device is articularly applicable to situations where iquids and materials in powdered and pulverized form are transported, as there is no danger of the contents of the receptacle that is being supported slo ping over or spilling.

n accordance with the provisions of the patent statutes, I have described the principle of my invention, together with the apparatus which I now consider to re resent the best embodiment thereof; but desire to have it understood that the apparatus shown is merely illustrative and that the invention can be carried out in other ways.

Having now described my invention what I claim as new and desire to secure by Letters Patent is:

1. A trolley for overhead rails, having a U-shaped yoke, the limbs of which carry the wheels, the body of the yoke being sharply bent to form the limbs, and the portion between the limbs being uncurved, the distance between the limbs being greater than the distance between the flanges of the wheels, and having means for reinforcing the yoke between the limbs, whereby any flexing of the yoke by overload will be confined to the bent portions and will cause a more perfect bearing of the wheels upon the rail.

2. A trolley for overhead rails having a yoke, and cross pieces carrying the wheels, the limbs of the yoke overhanging the cross ieces, and being beveled at that point to form blunt knife-edges.

3. A trolley for overhead rails having a support for the hook, the support being liked in relation to the trolley, there being a single point of contact between the hook and support irrespective of the relative position of the hook and support, the support holding the hook parallel with the rail.

4. A trolley for overhead rails having a support, a beveled hole in the support, the said hole being for engagement of the hook, the said hole extending in the same direction as the rail and the apex ol the bevel lying at right angles to the rail.

5. A trolley for overhead rails, which has a yoke and a link engaging with the yoke, the said link being made in two pieces with books engaging with the yoke, the two pieces being secured together.

This specification signed and witnessed this 22nd day of April, 1907.

EWAN (AM ERON.

Witnesses:

JNO. ROBT TAYLOR, LEONARD H. Dunc. 

